The dry-weight mass of a plant (the weight of plant solids after water is remove
ID: 163801 • Letter: T
Question
The dry-weight mass of a plant (the weight of plant solids after water is removed) is from Carbon dioxide absorbed from the air Water absorbed from the air Carbon dioxide absorbed from the soil Water absorbed from the soil Nutrients absorbed form the soil Which statement is correct Red light (lambda = 680 nm) has more energy than blue Blue light (lambda = 420 nm) has more energy than red Red light (lambda = 420 nm) has more energy than blue Blue light (lambda = 680 nm) has more energy than red The antennae complexes of photosynthesis gather light energy and channel it toward (circle ALL that apply) ATPase Plastoquinone/plastiquinol Photosystem II Photosystem I Cytochrome b6fExplanation / Answer
Answer 8:
The nutrient or mineral content of plant tissues are often expressed on a dry matter basis, i.e. as a proportion of the total dry matter in the material. For example a 138-gram apple contains 84% water (116 g water and 22 g dry matter per apple). The potassium content is 0.72% on a dry matter basis, i.e. 0.72% of the dry matter is potassium. The apple, therefore, contains 158 mg potassium (0.72/100 X 22 g).
Carbon dioxide is only exhaled from the plant during respiraton and hence do not contribute towards the dry weight. Also, since the dry weight is considered, that is the weight of plant solids after water is removed, therefore, absorbed water does not contribute as well towards the plant dry weight.
Therefore, the answer is Option D: Nutrients absorbed from the soil.
Answer 9:
As wavelength of light decreases, frequency increases. Also, energy associated with light is given by the formula: E=hf, where E is the Energy, h is a constant (Planck's constant) and f is the frequency. Therefore, as the frequency of light increases, its associated energy increases as well and waves with a short wavelength have the most energy.
In this regards, since blue light has a shorter wavelength range than red (Blue = 500 – 420 nm and Red = 740 – 625 nm), therefore blue light has more energy. Blue light wavelength range falls in around 500 – 420 nm.
Therefore, the answer is Option B: Blue light (Blue 420 nm) has more energy than red.
Answer 10:
The first act of photosynthesis is the absorption of photons by antenna molecules (within femtoseconds), leading to the formation of excited chlorophyll molecules (Chl*). These Chl* decay to ground state by (1) excitation energy transfer to reaction centers, leading to photochemistry, (2) light emission as fluorescence, and (3) heat loss. The production of oxygen, NADPH, and ATP requires the four major multiprotein complexes of PSI and PSII, the cytochrome b6/f complex (Cyt bf), and ATP synthase, plus a multitude of antenna complexes whose major function is to transfer excitation energy to the photosynthetic reaction centers.
Therefore, the Answer is Option C, D and E: Photosystem II, Photosystem I and Cytochrome b6f
Note: ATP Synthase and ATPase are two opposite enzymes
Thank you!
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